what is fedelity in physics
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Fidelity of quantum states. ... It expresses the probability that one state will pass a test to identify as the other. The fidelity is not a metric on the space of density matrices, but it can be used to define the Bures metric on this space. Given two states and , the fidelity is generally defined as the quantity .
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fidelity is a measure of the "closeness" of two quantum states.
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